Saw-mill carriage



(No Model.) 2 Sheets-Sheet 1.

DI WITT o. IIIIIISCOIT.` SAW MILL CARRIAGE.

'Patente-d Jan. 17,1888.

WL'/zes 6 es l TEW/'66 6.2712860 6 M my N. PETERS, Phalo-lihgnpbot. Washington. ILC.

(No Model.) y 2 sheets-sheet :2;y

DE W'TT C.. PRESCOTT.

` SAW MILL CARRIAGE.

No. 376,678. y PatentedlJan. 17, 1888.

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- UNITED t STATES PATENT OFFICE.

DE WITT CLINTON ransoOTr-OF MARINETTE, wIsooNsIN.

SAW-MILL CARRIAGE.

'SPECIFICATION 'forming part of Letters Patent No.V 376,678, dated January 17,1888.

Application tiled June 9, 1887.

To all whom, it may concern.-

Beit known that I, DE WITT CLINTON PRES- GOTT, a citizen of the United States, residing at Marinette, in the county of Marinette and State of Wisconsin, have invented a certain new and useful Improvement in Saw-Mill Garriages, which is fully set forth in the following specification, reference being had -to the accompanying drawings, in whichy Figure 1 is a plan view of a saw-mill carriage embodying my invention; Fig. 2, a side elevation of the same; Fig. 3, a detail sectional view taken on the line 1 1 of Fig. 1; Fig. 4, a detail sectional view taken on the line 2 2 of I5 Fig. 1; Fig. 5, a detail plan section taken on the line 3 3 of Fig. 4; Fig. 6, a detail View of the friction-band mechanism; Fig. 7, a'detail sectional view of the cam-shifting device detached, taken on a line corresponding to the 2O line t L.tof Fig. 5; and Fig. 8, a detail sectional view of the same, taken'on the line 5 5 of Fig. 7. Figs. I and 2 are on the. same scale: Figs. 3 to 8, inclusive, are on the same scale with respect to each other, but on an enlarged yscale 2'5 with respect to Figs. 1 and 2.

Like letters refer tov like parts in all the figures ofthe drawings.

My invention relates to saw-mill carriages, and more particularly to that class in which the carriage is provided with automatic means for shifting the log clear of the sawupon its return movement and advancing the same to itsoriginal position upon its` forward movement, and-it has for its object to provide a 3 5 simple and efficient construction for positively of trucks composed of axles B, provided. with wheels b and b', secured to said axles and ref volving therewith. These wheels travel upon the rails C and C', the said wheels and rails being constructed in any approved form, al-

though I prefer that shown, in which one of therails, as Cis provided with a projecting rib,

while the corresponding wheel, b', is grooved Serial No. 240,834. (No model.)

tov fit upon the'rib and prevent lateral displacem'ent ofthe trucks.

The carriage A is free to move laterally upon,the axles B, so as to clear the log of the saw upon the return movement of the carriage and allow it to be movedl up into position again upon the forward movement, and it is to the means for effecting this lateral movement of the carriage that my present invention more particularly relates. Upon one or more of the axles Bis secured a friction-wheel, D, which revolves with the said axle. e

D represents a friction band or ring surrounding the friction-'Wheel D, the said band beingv split or divided, as shown at d, and provided with an adjusting vbolt or screw, d',

by means of which it may be tightened or loos-y ened, as desired. The said friction-band is preferably provided with an inner facing, d2, of vulcanized ber or other suitable material, and has upon its outer peripherya projecting lug, D2, in the ypath of which are arranged stops or buffers -to limit its travel. These stops or buffers are preferably constructed as follows:

E represents a plate secured to the frame A and carr in boxes E and El arranged on each y g a :s

side ofthe friction-band D. Vithin suitable recesses in the boxes E' and E2 are arranged blocks of rubber, e and c2, which may be adjusted to project to a greater orless extent,as

desired, by means of adj usting-screws e, passing through the boxes andbearing against their inner ends. This friction-band device, although of my invention, is not claimed by Ssf me specifically in the present application, as

it forms the subject-matter of claims presented in another application filed by me August 2, 1886, Serial N o. 209,799. I have shown and described them in the present instance as the form of actuating mechanism for my shifting Y tion-bands serve, by means of pitmen D3, to operate the cam-shifting devices for giving to the saw-mill carriage a lateral movement uponv the axles B. In the present instance I have shown two of these cam-shifting devices as employed, one being arranged near each end of the carriage, although it is of course obvious that a greater or less number may be used, if desired. The two shifting devices being identical in their construction, I will describe only one of them, it being of course understood that the same description is equally applicable to the other. The end axle, B, is provided with fixed collars b2,between which is arranged a sleeve, F, mounted loosely on the shaft, so as to be capable of a rocking or oscillating movement around the same, the collars b2 preventing any lateral movement of the said sleeve. An arm,f, extends downward from the said sleeve and has connected to its lower end the pitman D5 by means of a bolt or pin, j", passing through a suitable boss or hub, F', on the lower end of the arm f. v

On its upper side the sleeve F is provide with a cam-groove, F2, which is suitably inclined with relation to the axis of the sleeve F, and consequently to the direction of motion of the entire carriage. This cam-groove F2 is preferably formed by means of parallel inclinedprojections F3, which co-operate with a suitable fixed projection on the frame A,which projection enters the groove F2 between the cam projections F3, so that when the sleeve F is oscillated or vibrated a lateral movement will be imparted to the frame. In its preferred form this projection cons-ists of aroller, G, mounted on a suitable axis or support, g, carried by a transverse beam, G', attached to the frame A or forming a portion of the said framing.

The cam projections F3 are provided with bearing-surfaces f 3, of steel or anti-friction metal, against which the roller G may act, and these surfaces are detachable for the purpose of renewal or repair, being secured to the projections by bolts f3, or in any other suitable manner.

In order to properly lubrieate the sleeve F, I provide within the walls of the same oilchambers H, (shown more particularly in Figs. 7 and 8 ofthe drawings,)the said oilchambers being provided with tillingpassages h and with lubricatingpassages 7L', leading to the bearing-surface ot' the sleeve F.

I will now proceed to describe the operation of my improved saw-mill carriage, premising that the operation of the friction devices is the same as that described in my other application hereinbefore specified, and therefore needs no extended description here. rIhe parts having been properly adjusted, the carriage will start upon its forward travel to make the first eut, when the friction-bands will, through the operation of the pitmen D3, impart a rotary motion to the sleeves F, causing the same to make a' partial rotation around the axles B, on which they are mounted, and,

through the medium of the cam-grooves F3, formed by the cam projections F3, to imparta lateral movement to the frame A upon the axles B, this lateral movement being suicent to present the log to the saw in proper position to make the first cut. When the carriage has completed its forward journey and the direction ot'its travel is reversed, the frictionbands will, through the medium of the pitmen D3, impart apartial movement of rotation to the sleeves F, and will move the frame Abodily upon the axles away from the saw, thereby carrying the loglfrom the saw and preventing any contact between the two during the return movement of the carriage.

It will be seen that the cam-shifting device described providcsasimple and efficient means for shifting the carriage laterally, it being of such a nature that it operates positivelyand quickly, while all the parts are opened to inspection and may be readily cleaned or repaired when necessary. 'Ihe trst cost is slight, and the mechanism, not being delicate, is not liable to get out of order.

It will of course be understood that various modiiications may be made without departing from the principle of my invention. For instance, although I prefer to employ the connecting-rod D4 between the friction-bands, in order to insure simultaneous operation of the two, still this rod may be dispensed with. Moreover, although I have shown the camshifting devices as mounted directly upon ,the axles, they might be supported from these axles in any suitable manner for eifecting their purpose. I therefore do not wish to be understood as limiting myself strictly to the precise details of construction hereinbefore set forth, and shown in the drawings.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a saw-mill carriage, the combination, with the truck-axles, of the carriage-frame capable of lateral movement on the axles, one or more cam-shifting devices mounted on the said axles, capable of a limited oscillation thereon, and each consisting of a sleeve provided with a cam-groove, a suitable fixed projection from the carriage-frame to enter said groove, and mechanism for partially rotating or oscillating the said cam-shift-ing devices in each direction to shift t-he carriage, substantially as and for the purposes specified.

2. In a saw-mill carriage, the combination, with the truck-axles, of the carriage-frame capable of lateral movement on the axles, eamshifting devices supported on the axles and each provided with a cam-groove, corresponding projections on the carriage to enter the said grooves, and actuating mechanism connecting the cam-shifting devices and one or more of the axles, substantially as and for the purposes specified.

3. In a saw-mill carriage, the combination, with the truck-axles, of the carriage-frame capable of lateral movement on the axles, the

IIO

376.678 l I ks cam-shifting devices mounted on one or more of the axles and each provided With a camgroove, a corresponding projection on the carriage-frame, and friction-Wheels mounted on projection G ofthe carriageframe, the frictionwheels D, having frictionbands D', yand the connecting-rod D4 and pit-men D5, substantially as and for the purposes specified.

5. In a sawmill carriage, the/combination, with the truck-axle B, having fixed collars b2, of the sleeve F, mounted on said axle between the said collars, and provided with the inclined projections F3, forming the cam-groove F2, and the carriage-frame A, capableof lateral movement on the sai`d axle and provided with the roller G, arranged between the projections F3, substantially as and for the purposes specified.

'6. In a saw-millcarriage, the combination, with the axlev B, of the carriage-frame A, capa` ble of lateral movement thereon, the roller G,

mounted on a projection from said frame, the

sleeve F, mounted on the axle and provided with cam proj ectionsF3, arranged to embrace said roller, and separate bearing-piecesf3 for the roller, detachably secured .to the projections F3, substantially as andfor the purposes specified. l

7. In a sawmill carriage, the combination, with .the axle B, of the sleeve F, mounted thereon and provided with cam projections to operate the carriage-frame, said sleeve being provided with oil-chambers H Yon each side thereof, having filling-,apertures hand lubrieating-passages h', and the carriage-frame provided with a projection engaging'with the cams of said sleeve, s ubstantiallyasand for the purposes specified. v.

DE WITT .CLINTN PRESCOTT.

Witnesses:

W. I?. MARS, j JOHN J. ANDREW.r 

